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Machining of fibre reinforced plastics.

Bearbeiten faserverstärkter Kunststoffe
: Graß, P.; König, W.; Schmitz-Justen, C.
: Fraunhofer-Institut für Produktionstechnologie -IPT-, Aachen

Aachen, 1989
Composite Materials Workshop <1989, Leuven>
Fraunhofer IPT ()
Aramidfaser; Bearbeitungsqualität; Bohrung; Fräsen; Glasfaser; Kohlenstoffaser; Kunststoff; Laserstrahlschneiden; Wasserstrahlschneiden

Fibre reinforced plastics (frp) have gained great importance among the composites since glass fibre reinforced polyester emerged in the thirties. Annual rates of increase allow to expect an extensive application of these materials also for future times. Besides the two-dimensional cutting operations of prepregs a finish machining operation of three-dimensionally curved components is usually necessary. Cutting with ultrasonic excited blased is feasible for prepregs with very good cutting quality and high feed rates. Mechanical techniques like drilling and trim routing perform well for cured laminates. For the machining of gfrp and cfrp a conventional tool geometry is usable; since high abrasion resistance is necessary pcd or carbide of fine grain should be used. Afrps require a special tool geometry with very sharp cutting edges, tools are commonly made out of cemented carbide. Apart from physical properties of the materials, cutting energy and time of contact affect the course of tempe rature. These depend on workpiece, tool and cutting conditions. Thermographic experiments show temperatures of more than 300 degree C. Water jet cutting is found to be well suited for thin laminates. The development of the abrasive water jet cutting allows to cut even thick laminates with significantly better quality and higher feed rates. Due to the thermal properties of the material in general afrp are well, gfrp less and cfrp are hardly suited for laser cutting.